Yeah, this is one of the reason. I don't have a plan to earn a living with this app now, but it depends on how many users use the app and how much the infrastructure costs. If the app is used by many users, I'd like to think about paid option with additional features (eg. providing API, managed database, etc) and keep free plan with current features.

Yeah agree. I would rather pay $10/year or something. Right now I still have to trust that the developer won't just copy all the data I'm writing. I don't have any reason to trust them if I can't see the code and I'm not paying. Not going to use it for that reason.

Thank you for your opinion! I wrote how the app handles data on the privacy policy page (https://site.ducknote.app/privacy/), but your opinion is understandable.